Determination of Chemical Oxygen Demand (COD) (SM 5220 B Method)

SM 5220 B method, which includes a test method for the determination of chemical oxygen demand (COD), within the scope of the National Environmental Methods Index (NEMI) developed. Chemical oxygen demand is defined as a certain amount of oxidant that reacts with the sample under controlled conditions. The amount of oxidant consumed is expressed in oxygen equivalents.

The oxidant specified in the SM 5220 B method is the dichromate ion with its unique chemical properties. Both organic and inorganic components of a sample are subject to oxidation, but in most cases the organic component predominates. If organic or inorganic chemical oxygen demand is to be measured alone, additional steps are required to separate one from the other.

Chemical oxygen demand is often used as a measure of pollutants in wastewater and natural waters. Other relevant analytical values ​​are biochemical oxygen demand, total organic carbon and total oxygen demand. Biochemical oxygen demand is a measure of the oxygen consumed by microorganisms under certain conditions. Total organic carbon is a measure of organic carbon in a sample. Total oxygen demand, on the other hand, is a measure of the amount of oxygen consumed by all elements in a sample when full oxidation is achieved.

In the tests and analyzes carried out in our organization, which has a wide range of technological equipment, trained and experienced staff and applies the most modern methods, national and international standards and legal regulations in force are complied with. Chemical oxygen demand (COD) determination (SM 5220 B method) services are among the numerous tests performed in this context.